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BackLib="Transistor_BJT" part="2N3904" description="0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols | | Tayda | A-3588 | | R30 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>